Export the APIs submitted by Dawn to the Python bindings.  Add a simple test case for the SBModule.compile_unit_iter() API.

llvm-svn: 152952
diff --git a/lldb/scripts/Python/interface/SBModule.i b/lldb/scripts/Python/interface/SBModule.i
index c826134..1b6d4ec 100644
--- a/lldb/scripts/Python/interface/SBModule.i
+++ b/lldb/scripts/Python/interface/SBModule.i
@@ -165,6 +165,12 @@
     bool
     GetDescription (lldb::SBStream &description);
 
+    uint32_t
+    GetNumCompileUnits();
+
+    lldb::SBCompileUnit
+    GetCompileUnitAtIndex (uint32_t);
+
     size_t
     GetNumSymbols ();